update change log (#712)

Author: ywy2090

Changelog.md

@@ -1,3 +1,20 @@
+## v3.1.2
+(2023-01-04)
+
+请阅读Java SDK v3.x+文档：
+
+- [中文用户手册](https://fisco-bcos-doc.readthedocs.io/zh_CN/latest/docs/develop/sdk/java_sdk/index.html)
+
+### 新增
+
+- 发送交易支持设置`extraData`字段
+
+### 兼容性说明
+
+- 兼容java-sdk v3.0+的历史版本
+- 仅支持[FISCO BCOS 3.0.0](https://github.com/FISCO-BCOS/FISCO-BCOS/releases/tag/v3.0.0)及以上版本
+
+
 ## v3.1.1
 (2022-12-8)
 

build.gradle

@@ -25,7 +25,7 @@ ext {
     junitVersion = '4.13.2'
     commonsCollections4Version = "4.4"
     guavaVersion = '30.1.1-jre'
-    bcosSdkJniVersion = "3.1.2-SNAPSHOT"
+    bcosSdkJniVersion = "3.1.0"
     slf4jApiVerison = '2.0.3'
     mockitoVersion = '4.8.0'
 }
@@ -34,7 +34,7 @@ ext {
 // integrationTest.mustRunAfter test
 allprojects {
     group = 'org.fisco-bcos.java-sdk'
-    version = '3.1.2-SNAPSHOT'
+    version = '3.1.2'
 
     apply plugin: 'maven-publish'
     apply plugin: 'idea'